CN110901163B

CN110901163B - Production process of paper disc

Info

Publication number: CN110901163B
Application number: CN201911284700.7A
Authority: CN
Inventors: 杨红祥
Original assignee: Ningbo Hongtai Packaging New Material Technology Co ltd
Current assignee: Ningbo Hongtai Packaging New Material Technology Co ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2023-12-26
Anticipated expiration: 2039-12-13
Also published as: CN110901163A

Abstract

The invention discloses a production process of a paper pulp tray, which relates to the field of disposable paper trays and mainly comprises the following steps of spraying a humidifying agent on both sides of base paper; cutting the paperboard mould into a specified shape; thirdly, placing the wet and sheared paper board in a mould for forming; fourthly, controlling the temperature of the die to be 120-150 ℃ for 1-1.2 s, and carrying out pressurized drying on the paperboard; and fifthly, taking the paperboard out of the die, and cooling at room temperature to obtain the finished paper disc. By adopting the technical scheme, the step of preparing paper pulp is omitted, so that pollutants generated in the paper pulp preparation process can be reduced, a large amount of water and electric power resources are consumed, and meanwhile, the time for drying and solidifying paper pulp into finished paper can be shortened, and the production efficiency is improved.

Description

Production process of paper disc

Technical Field

The invention relates to the field of disposable paper disc production, in particular to a paper disc production process.

Background

Along with the development of modern scientific technology, the pace of life is faster and faster, people require the life to be simple and fast, disposable products enter the life of people, and the paper disc has the advantages of convenience and sanitation, thereby bringing great convenience to our daily life. At present, a large number of disposable plates are made of plastics, and the white pollution state of China to date seriously threatens the daily life of people. The disposable plates made of plastic materials used in the past have not been suitable for the current social development, and have been abandoned by the market at present due to the problem of difficult degradation. Therefore, it is important to develop a paper tray that can be completely degraded.

In the production process of the existing paper disc, firstly, paper pulp needs to be prepared, then the paper pulp is cast into a mould, and after the paper pulp is solidified and cooled, the paper disc is formed. The application document with the publication number of CN109371747A and the processing technical field of disposable paper discs specifically disclose a preparation method of a disposable degradable paper disc, which comprises the following steps: s1, mixing bamboo fibers, hemp stalk fibers and bagasse fibers, then soaking in an acetic acid solution, then washing with clear water, drying and crushing to obtain mixed fiber powder; s2, adding the coagulated polysaccharide, sodium alginate and chitosan into purified water, uniformly stirring, and then carrying out water bath heat preservation to obtain a mixed adhesive; s3, adding the mixed fiber powder, the mixed adhesive and the corn starch into a mixer, uniformly mixing to obtain a mixture, and then sending the mixture into a molding press for hot press molding to obtain a tray body; and S4, uniformly coating the composite film forming liquid on the inner surface of the tray body, drying at constant temperature, and cooling to obtain the disposable degradable paper tray. Although, this disposable degradable paper tray is waterproof, oil-resistant, and has excellent degradability.

However, in the process of preparing paper pulp, mixed adhesive and various auxiliary agents are required to be added, so that industrial sewage is easy to generate on one hand, and organic waste gas is easy to generate on the other hand, and environmental pollution is easy to cause.

Disclosure of Invention

The invention aims to provide a production process of a paper disc, which not only can reduce pollution to the environment, but also can improve the production efficiency.

The above object of the present invention is achieved by the following technical solutions: a production process of a paper disc is characterized by comprising the following steps of: comprises the following steps of the method,

spraying a humidifying agent on both sides of the paperboard;

cutting the paperboard mould into a specified shape;

step three, placing the paperboard subjected to die cutting and humidification in the step two into a die;

fourthly, controlling the temperature of the die to be 120-150 ℃ for 1-1.2 s, and carrying out pressurized drying on the paperboard;

and fifthly, taking the paperboard out of the die, and cooling at room temperature to obtain the finished paper disc.

By adopting the technical scheme, the step of preparing paper pulp is omitted, so that pollutants generated in the paper pulp preparing process can be reduced, and the time for drying and solidifying paper pulp into finished paper can be shortened, thereby improving the production efficiency.

Preferably, after the humidifying agent is sprayed in the second step, the humidifying agent on the two sides of the paperboard is uniformly spread by using a scraper.

Through adopting above-mentioned technical scheme, utilize the scraper to spread out the humidifier on the cardboard, be favorable to the cardboard to absorb the humidifier fully like this to realize the effect that the cardboard softened, and then be convenient for follow-up operation go on.

Preferably, the humidifier comprises 5% of ethanol, 2% of methyl silicone oil, 60% of acrylic resin and the balance of distilled water by volume fraction.

By adopting the technical scheme, because the methyl silicone oil is insoluble in water, and the methyl silicone oil and the water are fully mutually soluble by adding the ethanol. Secondly, during the press drying process in the mould, the ethanol and water volatilize, so that the methyl silicone oil remains on the cardboard. On one hand, the paper disc is convenient to demould, on the other hand, because the methyl silicone oil can stay on the surface of the paper disc, the paper disc is equivalent to forming a protective layer on the surface of the paper disc, and the paper disc is not easy to soften even if food contains water due to the hydrophobic property.

Preferably, the humidifying agent contains 7-11 wt% of crab shell powder.

By adopting the technical scheme, as the main component of the crab shell powder is calcium carbonate, when the crab shell powder is sprayed on the paper disc, the paper disc is easier to be shaped in the mould pressing process.

Preferably, the crab shell powder is soaked in 5% NaOH solution for about 15-17 hours, and then boiled for 30-40 min by using 10% NaOH solution.

By adopting the scheme, the crab shell contains a certain amount of chitin, so that the crab shell has good sterilization and bacteriostasis functions. The chitin can be separated from the lipid of the crab shell after the crab shell is treated by alkali liquor, so that when crab shell powder is sprayed onto the paper disc along with the humidifying agent, the chitin can be gradually immersed into the paper disc, and the paper disc has antibacterial property, so that the crab shell powder can be stored for a long time.

Preferably, the humidifier contains 1 to 3wt% of iodinated salt.

Preferably, the iodized salt is a mixture of lithium iodide and copper iodide, and the mass ratio of the lithium iodide to the copper iodide is 1:1.

by adopting the technical scheme, lithium ions and copper ions in the iodized salt can also coordinate with carbonyl groups on cellulose of the paper tray, so that a network-like structure is generated, and thus, when the cellulose molecular chain is decomposed by heating, a larger energy barrier needs to be overcome than a completely free molecular chain, and further, the paper tray is promoted to have a higher thermal decomposition temperature, and the paper tray is favorable for containing foods with higher temperature.

Preferably, in the process of spraying the humidifying agent in the first step, the surrounding environment is controlled at 60 ℃, and the saturation degree of the humidifying agent contained in the paperboard is 30-35 wt%.

Through adopting above-mentioned technical scheme, with ambient temperature control at 60 ℃, be equivalent to like this can preheat the cardboard, simultaneously, control the cardboard contains the saturation of humidifier at 30 ~ 35wt%, can guarantee on the one hand that the cardboard can have better compliance like this, also can avoid simultaneously because the too big problem that appears slurrying of cardboard humidity.

Preferably, in the fourth step, the mold is heated by microwaves, and the frequency of the microwaves is controlled to be 500 MHz-800 MHz.

Through adopting above-mentioned technical scheme, because in the microwave heating process, the inside of cardboard can be heated with outside synchronization in step, in the mould pressing process like this, can avoid the inside not totally dry of cardboard when, the outside is because the too dry problem that appears coking of outside.

Meanwhile, the frequency of the microwaves is controlled to be 500 MHz-800 MHz, so that the paperboard can be fully dried in the heating process of 1-1.2 s.

In summary, the beneficial technical effects of the invention are as follows:

1. the step of preparing paper pulp is omitted, so that on one hand, the pollution to the environment can be reduced, and on the other hand, the production efficiency can be improved;

2. the mixed solution of ethanol, methyl silicone oil, acrylic resin and water vapor is selected as a humidifying agent, so that the softening of the paper board can be ensured, and the paper board has waterproof performance after the paper board is pressed and molded by a die;

3. the paper board is heated by microwaves, so that the synchronous drying of the inside and the outside of the paper board can be ensured, and the quality of the paper board is improved.

Detailed Description

Embodiment 1,

Firstly, controlling the ambient temperature at 60 ℃, spraying a humidifying agent on both sides of a paperboard, and uniformly spreading the humidifying agent on both sides of the paperboard by using a scraper to ensure that the saturation of the humidifying agent contained in the paperboard is 30wt%;

cutting the paperboard mould into a specified shape;

step three, placing the paperboard subjected to humidifying die cutting in a die;

fourthly, controlling the temperature of the die at 120 ℃ for 1-3 seconds, and carrying out pressurized drying on the paperboard;

The mold in the fourth step is heated by microwaves, the frequency of the microwaves is controlled at 500MHz, and the humidifying agent comprises 5% of ethanol, 2% of methyl silicone oil, 60% of acrylic resin and the balance of distilled water according to volume fraction. In addition, the humidifier also contains 7wt% of crab shell powder and 1wt% of iodized salt, and the crab shell powder is prepared by grinding crab shell after soaking in 5wt% NaOH solution for about 15h and then boiling with 10wt% NaOH solution for 30 min. The iodized salt is a mixture of lithium iodide and copper iodide, and the mass ratio of the lithium iodide to the copper iodide is 1:1.

embodiment II,

Firstly, controlling the ambient temperature at 60 ℃, spraying a humidifying agent on both sides of a paperboard, and uniformly spreading the humidifying agent on both sides of the paperboard by using a scraper to ensure that the saturation of the humidifying agent contained in the paperboard is 33wt%;

cutting the paperboard mould into a specified shape;

fourthly, controlling the temperature of the die at 135 ℃ for 1.1s, and carrying out pressurized drying on the paperboard;

The mold in the fourth step is heated by microwaves, the frequency of the microwaves is controlled at 650MHz, and the humidifying agent comprises 5% of ethanol, 2% of methyl silicone oil, 60% of acrylic resin and the balance of distilled water according to volume fraction. In addition, the humidifier also contains 9wt% of crab shell powder and 2wt% of iodized salt, and the crab shell powder is prepared by soaking in 5% NaOH solution for about 16h, then boiling with 10% NaOH solution for 35min, and grinding the crab shell. The iodized salt is a mixture of lithium iodide and copper iodide, and the mass ratio of the lithium iodide to the copper iodide is 1:1.

comparative example one,

The difference between this comparative example and example two is that the humidifier ethanol of this comparative example is entirely replaced by distilled water.

Comparative example II,

The difference between this comparative example and example two is that the humidifier methyl silicone oil of this comparative example is entirely replaced by distilled water.

Third embodiment,

Firstly, controlling the ambient temperature at 60 ℃, spraying a humidifying agent on both sides of a paperboard, and uniformly spreading the humidifying agent on both sides of the paperboard by using a scraper to ensure that the saturation of the humidifying agent contained in the paperboard is 35wt%;

cutting the paperboard mould into a specified shape;

fourthly, controlling the temperature of the die at 150 ℃ for 1.2 seconds, and carrying out pressurized drying on the paperboard;

The mold in the fourth step is heated by microwaves, the frequency of the microwaves is controlled to be 500 MHz-800 MHz, and the humidifying agent comprises 5% of ethanol, 2% of methyl silicone oil, 60% of acrylic resin and the balance of distilled water according to volume fraction. In addition, the humidifier also contains 11wt% of crab shell powder and 3wt% of iodized salt, and the crab shell powder is prepared by soaking in 5% NaOH solution for about 17h, then boiling with 10% NaOH solution for 40min, and grinding the crab shell to obtain 5 um. The iodized salt is a mixture of lithium iodide and copper iodide, and the mass ratio of the lithium iodide to the copper iodide is 1:1.

fourth embodiment,

cutting the paperboard mould into a specified shape;

fourthly, controlling the temperature of the die at 120 ℃ for 1.1s, and carrying out pressurized drying on the paperboard;

The mold in the fourth step is heated by microwaves, the frequency of the microwaves is controlled to be 500 MHz-800 MHz, and the humidifying agent comprises 5% of ethanol, 2% of methyl silicone oil, 60% of acrylic resin and the balance of distilled water according to volume fraction. In addition, the humidifier also contains 11wt% of crab shell powder and 1wt% of iodized salt, and the crab shell powder is prepared by soaking in 5% NaOH solution for about 17h, then boiling with 10% NaOH solution for 35min, and grinding the crab shell to obtain 5 um. The iodized salt is a mixture of lithium iodide and copper iodide, and the mass ratio of the lithium iodide to the copper iodide is 1:1.

comparative example III,

The difference between this comparative example and example four is that no crab shell meal was added.

Comparative example four,

The difference between this comparative example and example four is that the added crab shell meal was not treated with lye.

Fifth embodiment (V),

cutting the paperboard mould into a specified shape;

fourthly, controlling the temperature of the die at 120 ℃ for 1.2 seconds, and carrying out pressurized drying on the paperboard;

The mold in the fourth step is heated by microwaves, the frequency of the microwaves is controlled to be 500 MHz-800 MHz, and the humidifying agent comprises 5% of ethanol, 2% of methyl silicone oil, 60% of acrylic acid and the balance of distilled water according to volume fraction. In addition, the humidifier also contains 7wt% of crab shell powder and 2wt% of iodized salt, and the crab shell powder is prepared by soaking in 5% NaOH solution for about 17h, boiling with 10% NaOH solution for 30min, and grinding to obtain 5um crab shell. The iodized salt is a mixture of lithium iodide and copper iodide, and the mass ratio of the lithium iodide to the copper iodide is 1:1.

comparative example five,

The difference between this comparative example and example five is that no iodinated salt was added.

Comparative example six,

The difference between this comparative example and example five is that the iodinated salt of this comparative example is lithium iodide.

Comparative example seven,

The difference between this comparative example and the fifth example is that: the iodized salt of this comparative example was copper iodide.

The tray was tested by the following test method:

1. directly testing the bending strength of the paper disc by using a bending machine, wherein F1/Pa;

2. 10ml of water was poured onto the tray, and after 5min, it was observed whether the tray was wet;

3. dropping the culture liquid on a paper disc, placing the paper disc in a normal temperature environment, and observing the number of colonies on the paper disc after 3 days, cfu;

4. the trays were placed in a 100℃environment for 30min, and then tested for flexural strength, F2/Pa.

The test results are shown in table one below:

list one

Test item	F1 bending strength/Pa	Whether or not to wet	Colony/cfu	F2 bending strength/Pa
					Example 1	1237	Without any means for	1	1201
Example two	1246	Without any means for	0	1212
					Comparative example one	1234	With parts	1	1206
Comparative example two	1236	Large area of	0	1207
					Example III	1259	Without any means for	0	1228
Example IV	1249	Without any means for	0	1214
					Comparative example three	965	Without any means for	16	921
Comparative example four	1243	Without any means for	13	1210
					Example five	1252	Without any means for	0	1223
Comparative example five	1241	Without any means for	0	986
					Comparative example six	1253	Without any means for	3	1024
Comparative example seven	1250	Without any means for	1	1015

As can be seen from the first table, the paperboard has strong bending strength, water resistance, antibacterial property and heat stability. Furthermore, the method comprises the steps of,

1. as can be seen from the comparison of the first comparative example and the second comparative example with the second example, when the ethanol and the methyl silicone oil are simultaneously applied to the humidifying agent, the humidifying agent is favorable for uniformly wetting the paperboard, and the waterproof performance of the finished paper tray can be comprehensively improved;

2. as can be seen from the comparison of the third comparative example and the fourth comparative example with the fourth example, the bending strength and the antibacterial performance of the paper disc can be effectively improved only by adding crab shell powder treated by alkali liquor;

3. as can be seen from the comparison between the fifth comparative example and the seventh comparative example with the fifth example, the addition of the iodized salt compounded by lithium iodide and cuprous iodide can effectively enhance the thermal stability of the paper tray;

4. compared with the traditional process from pulp production to finished paper trays, the paper pulp production process is simpler and more convenient, and is more environment-friendly.

The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.

Claims

1. A production process of a paper disc is characterized by comprising the following steps of: comprises the following steps of the method,

cutting the paperboard mould into a specified shape;

taking the paperboard out of the die, and cooling the paperboard at room temperature to obtain a finished paper disc;

the humidifier comprises 5% of ethanol, 2% of methyl silicone oil, 60% of acrylic resin and the balance of distilled water according to volume fraction;

the humidifying agent contains 11 weight percent of crab shell powder;

soaking the crab shell powder in 5% NaOH solution for about 17 hours, and then changing the crab shell powder into 10% NaOH solution and boiling for 40 minutes;

the humidifying agent contains 3 weight percent of iodized salt;

the iodized salt is a mixture of lithium iodide and copper iodide, and the mass ratio of the lithium iodide to the copper iodide is 1:1, a step of;

and in the fourth step, the die is heated by microwaves, and the frequency of the microwaves is controlled to be 500 MHz-800 MHz.